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<p>In this study, we investigated the development of a novel sensing device for the rapid and selective detection of NO<sub>2</sub>, addressing the critical need for accurate monitoring of air quality and human health. We utilized a simple hydrothermal method, assisted by ultrasound to fabricate In<sub>2</sub>O<sub>3</sub>@rGO for detecting NO<sub>2</sub> gas. The composite’s structure, morphology, composition, and specific surface area were analyzed using XRD, SEM, FTIR, XPS and BET techniques, respectively. XRD analysis revealed that pure In<sub>2</sub>O<sub>3</sub> exhibited a cubic phase, while In<sub>2</sub>O<sub>3</sub>/rGO composites showed peaks corresponding to both rGO and cubic-phase In<sub>2</sub>O<sub>3</sub>, with an average crystalline size ranging from 20 to 40&#xa0;nm. TEM analysis revealed that the synthesized In<sub>2</sub>O<sub>3</sub> exhibited a cubic spinal structure with spherical morphology. Nitrogen adsorption–desorption analysis showed that In<sub>2</sub>O<sub>3</sub> had a surface area of 27.3&#xa0;m<sup>2</sup>/g and a pore volume of 0.019&#xa0;cm<sup>3</sup>/g, while In<sub>2</sub>O<sub>3</sub>@rGO displayed higher surface area (45.4&#xa0;m<sup>2</sup>/g) and pore volume (0.041&#xa0;cm<sup>3</sup>/g). The gas sensing properties of the synthesized composites were evaluated using NO<sub>2</sub> gases. Through testing, the device demonstrated successful detection of gas concentrations within the 200-ppm range, showcasing its selective NO<sub>2</sub> detection amidst other pollutants such as CO, NH<sub>3</sub>, H<sub>2</sub>S, and SO<sub>2</sub>. Remarkable sensing performance was observed, including high sensitivity (274.3%), rapid response (21&#xa0;s), swift recovery time (36&#xa0;s), excellent selectivity, and long-term stability. The exceptional transport capability of rGO nanosheets may serve as highly conductive channels, accelerating carrier transfer and significantly reducing response and recovery times. The findings from this study underscore the promising capabilities of the developed sensing device for NO<sub>2</sub> detection at room temperature, opening doors for its utilization across diverse fields such as environmental monitoring, industrial safety, and public health.</p>

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Fabrication of 2D rGO decorated In2O3 hybrid sensor for efficient NO2 detection

  • 期刊论文

  • 发表日期：

    2025年3月10日

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  • S. Kumaran,
  • S. Navaneethan,
  • G. Nagalalli,
  • K. Kalaiarasi,
  • M. Dineshkumar

摘要

In this study, we investigated the development of a novel sensing device for the rapid and selective detection of NO2, addressing the critical need for accurate monitoring of air quality and human health. We utilized a simple hydrothermal method, assisted by ultrasound to fabricate In2O3@rGO for detecting NO2 gas. The composite’s structure, morphology, composition, and specific surface area were analyzed using XRD, SEM, FTIR, XPS and BET techniques, respectively. XRD analysis revealed that pure In2O3 exhibited a cubic phase, while In2O3/rGO composites showed peaks corresponding to both rGO and cubic-phase In2O3, with an average crystalline size ranging from 20 to 40 nm. TEM analysis revealed that the synthesized In2O3 exhibited a cubic spinal structure with spherical morphology. Nitrogen adsorption–desorption analysis showed that In2O3 had a surface area of 27.3 m2/g and a pore volume of 0.019 cm3/g, while In2O3@rGO displayed higher surface area (45.4 m2/g) and pore volume (0.041 cm3/g). The gas sensing properties of the synthesized composites were evaluated using NO2 gases. Through testing, the device demonstrated successful detection of gas concentrations within the 200-ppm range, showcasing its selective NO2 detection amidst other pollutants such as CO, NH3, H2S, and SO2. Remarkable sensing performance was observed, including high sensitivity (274.3%), rapid response (21 s), swift recovery time (36 s), excellent selectivity, and long-term stability. The exceptional transport capability of rGO nanosheets may serve as highly conductive channels, accelerating carrier transfer and significantly reducing response and recovery times. The findings from this study underscore the promising capabilities of the developed sensing device for NO2 detection at room temperature, opening doors for its utilization across diverse fields such as environmental monitoring, industrial safety, and public health.